Air admission and check valve for pneumatic tires.



No. 659,673. Patented Oct. I6, 1900-.

E. w. HOLT. AIR ADMISSION AND CHECK VA'LVE FOB PNEUMATIC TIRES.

(Application filed June 8, 1900.)

(No Model.)

//l VENTOIP ATTORNEYS PATENT OFFICEt EDWARD TVILLIAM HOLT, OF LONDON,ENGLAND.

AIR ADMISSION AND CHECK VALVE FOR PNEUMATIC TIRES.

SPECIFICATION formingpart of Letters Patent No. 659,673, dated October16, 1900.

Application filed June 8,1900.

To all whom it may concern.-

Be it known that I, EDWARD WILLIAM HOLT, a subject of the Queen of GreatBritain and Ireland, residing at Tottenham, London, England, haveinvented a new and Improved Air Admission and Check Valve for PneumaticTires, (for which I have made application for Letters Patent in GreatBritain under No. 9,066, hearing date May 16,1900,) of which thefollowing is a specification.

This invention consists in an improved form of air admission and checkvalve as applied to the supporting-rim and inner inflating-tube of apneumatic tire and is so designed as to be cheap of manufacture andcapable of being lifted from the outside by a wire or a hair-pin toallow issue of excess of air from the tube without removal of the valveor the valve-casing.

Figure l is a transverse section through my valve adapted to a pneumaticbicycle-tire. Fig. 2 is a plan of the same. Fig. 3 shows details of thevalve taken apart.

a is a pneumatic tire and cover mounted in any known manner in a rim 1).

c is the valve-casing, and d is a ball-valve, of rubber, metalcomposition, or any suitable material. The ball-valve 65 makes itsseating on the walls of a long cone 6 in the body of the casing and isnormally held up to such seating by a light spiral spring f behind it.The spring f is held in a screwed cover g, which closes the bottom ofthe casing c and forms an under flange, on which the inflatingtube isgripped bya nut h. The cover g has a central hole g for the passage ofthe air into and out of the inflating-tube. The narrow end of thecone-seating e terminates in a narrow entry-tube e for the admission ofthe air by a pump of any suitable description which is screwed onto theend of the casing Serial No. 19,599, (No model.)

0. When the inflation is finished, a screwed dustcap k is fixed onto theend of the casingc.

The spring-recoil of the ball-valve d insures the prompt closing of theair-passage after each forcing-stroke of the pump.

A disk flange or washer Z is used at the back of the in dating-tube tohold it up a convenient distance from the rim b.

The valve-casing c is secured to the rim 1) by a nut m on the outerscrewed shell of the casing 0.

Should the tube when inflated be found to contain excess pressure of airby expansion or otherwise, the pressure may be relieved by inserting awire or hair-pin through the entry-passage 6. After removal only of thedust-cap 7c the valve cl may be thus lifted from its seat and any excessof internal pressure in the in flation-tu be be allowedto escape.

Having now particularly described my invention, what I claim, and desireto secure by Letters Patent, is-

In combination with the inflation-tube and rim of a pneumatic tire avalve-casing, having a central passage and long conical chamber therein,a ball valve in said conical chamber; a flanged recessed cover, having acentral hole screwed into the base of said conical chamber; a spiralspring in the recess of said cover, pressing the valve into said conedchamber; a dust-cap closing central passage; and means for attachment ofvalvecasing both to tire-inflation tube, and to the metal rim,substantially as described.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

EDWARD WILLIAM HOLT.

